Pneumatic Air Gun Calculations

import matplotlib.pyplot as plt

Variables Outlined

Muzzle Velocity

Vm=var('Vm')

Atmospheric Pressure

Patm=var('Patm')

Gas Chamber Volume

Vc=var('Vc')

Barrel Area[Internal]

Ab=var('Ab')

Barrel Length

Lb=var('Lb')

Specific Heat of Air

k=var('k')

CB Ratio[see table]

cb=var('cb')

formula variable

eng=var('eng')

2nd Formula Variable

eng2=var('eng2')

Mass of the Projectile

md=var('md')

Operating Pressure in atm

Pc=var('Pc')

Definitions

k = 1.4 Patm = 101235 cb = 0.261208

m/s^2

Vm= 91.44 md=2 Pc=10 eng=0.618081

Main Formula

solve(eng=(k-1)mdVm^2/(2PatmVc*(Pc-Pc^(1/k)),Vc)

Can anyone tell me why this is giving a syntax error and pointing to my variable definition Vm? It's really bugging me!

Can anyone tell me why this is giving a syntax error and pointing to my variable definition Vm? It's really bugging me!

#Pneumatic Air Gun Calculations
import matplotlib.pyplot as plt

#Variables Outlined

#Muzzle Velocity
Vm=var('Vm')
#Atmospheric Pressure
Patm=var('Patm')
#Gas Chamber Volume
Vc=var('Vc')
#Barrel Area[Internal]
Ab=var('Ab')
#Barrel Length
Lb=var('Lb')
#Specific Heat of Air
k=var('k')
#CB Ratio[see table]
cb=var('cb')
#formula variable
eng=var('eng')
#2nd Formula Variable
eng2=var('eng2')
#Mass of the Projectile
md=var('md')
#Operating Pressure in atm
Pc=var('Pc')

#Definitions
k = 1.4
Patm = 101235
cb = 0.261208
#m/s^2
Vm= 91.44
md=2
Pc=10
eng=0.618081

#Main Formula
solve(eng=(k-1)*md*Vm^2/(2*Patm*Vc*(Pc-Pc^(1/k)),Vc)

Can anyone tell me why this is giving a syntax error and pointing to my variable definition Vm? It's really bugging me!